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| Jul-11-10 | | cracknik: This one jumped right out at me in about 3 seconds! |
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| Jul-11-10 | | CHESSTTCAMPS: <David2009:> I guess we were both tuned to the wrong wavelength. I also missed Na6 and Crafty showed me my error. |
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Jul-11-10
 | | OBIT: OK, compiling all the interesting commentary on today's position, I think a main line can be established: 55. Bxf5! exf5 56. Kxf5 Kf7 57. g4 Nb8 58. f3!! (58. f4? Na6! draws) Na6 59. f4 Nb8 60. g5 fg 61. fg hg 62. Kxg5 Kg7 63. Kf5 Kh6 64. Ke6 Kxh5 65. Kd6 Na6 66. Kc6 Kg6 67. Kb6 Nb8 68. Kxc5 Kf7 69. Kd6! (69. Kb6? Ke7 draws) Ke8 70. c5 and wins. Also, to those of you taking full credit for solving the position despite not realizing that moving the f-pawn to f3 instead of straight to f4 is a critical finesse: Wrongo!! You have failed miserably!! No soup for you!! But, at least you're not as bad as Karpov -- his refusal to play 55...exf5, thereby depriving Sirov of the opportunity to unveil this wonderful concept, has to be one of the most pusilanimous decisions I've ever seen from a GM. |
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Jul-11-10
 | | scormus: I failed today so I missed getting 6/6 for the week (no time on Thursday) 55 Bxf5, OK easy enough. I would have been entirely happy with that if I'd been sure B would NOT play exf5. I really had a problem with getting the winning continuation after 55 .... exf5, and I certainly woul not have played it OTB. To be honest I thought B could draw by shuffling the N between b8 and a6, hadnt realised how that little play <f3> would make all the difference. And the worst part was that only yesterday there was all this discussion about opposition. But I didnt take the hint :( Well done to the many kibitzers for seeing the win, more exactly seeing that the winning line was .... the winning line. And excellent analysis by <OBIT> Oh well, at least better than last week. Role on Monday, dash, its already Monday where I'm sitting. |
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| Jul-11-10 | | Marmot PFL: I was surprised that f3 vs f4 made any difference in the outcome. So I have to ask myself which I would have played. With enough time on the clock and energy to spare I might have worked it out. Frankly though I would probably have played f4 and gotten on with it. Which happens even with very strong players late in a game, as they are only human. Now if it was adjourned like in the old days a GM would be about 99% sure to get it right. |
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| Jul-11-10 | | Ferro: enhorabuena espaÑa |
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| Jul-11-10 | | wals: Analysis by Rybka 3 1-cpu: time 60min: depth 24:
1.  (4.85): 55...Kd6 56.Be4[] Nb8 57.Bg6[] Ke7 58.g4 Kd6 59.Bf7 2. (4.85): 55...Nb8 56.Bh7[] Kd6 57.g4 Nc6 58.Bg8 Nb8 59.Ke4 3. (4.85): 55...Kf7 56.Bg6+ Ke7 57.Be4 Nb8 58.Bh7 Kd6 59.g4 Nc6 60.Bg8 Nb8 61.Ke4 4. (4.85): 55...Kd7 56.g4[] Nb8 57.Bg6[] Kd6 58.Bf7 5. (5.12): 55...exf5 56.Kxf5[]
Black unravelled with 52...Kf7 +4.62.
Better, Kd7, +1.12. |
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Jul-11-10
 | | chrisowen: Earn fit salary does Valery. Paulsen testament after 13.e5 letter of line white a postulate more space ..roaming clergy.... influential coordination of salacious pawn structure. The Bg5 great silence leapt French like backward safe anorak, he presumed re. DSB doesnt have a future. Tired of hanging around B4 - and like a judge with no fingers after Kf7 Justice Thumbs aka Salov passes sentence. Bf5! it kinda wasnt funny springing such a surprise. |
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| Jul-11-10 | | kdogphs: First ever Sunday puzzle triumph on first try!!! |
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| Jul-11-10 | | jheiner: <Once> Particularly enjoyed today's qualitative post. Thanks. Good breakdown of the relevant fundamentals. |
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| Jul-11-10 | | WhiteRook48: 55 Bxf5 for the first time i got an insane puzzle...
considering how awful I am at chess puzzles, maybe it's not so insane? |
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| Jul-11-10 | | Eduardo Leon: Well, this puzzle turned out to be more complicated than I originally thought. My 58.f4 would have dropped half a point. Since, I don't believe in "puzzles half-solved", damn it, this week I don't have a perfect score. |
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| Jul-12-10 | | patzer2: For the Sunday July 11, 2010 puzzle solution, the sham sacrifice 55. Bxf5! proves White's active King and advanced pawns to be more powerful than Black's extra piece in this endgame position. Declining the piece offer is no better, as the game continuation demonstrates. |
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| Jul-13-10 | | Utopian2020: Utopian2020: <MarmotPFL> <<Utopian2020> If black plays Na6 white has Kb6, forcing Nb8, then Kxc5.> After 55. Bxf5 exf5, 56. Kxf5 Kf7, the white king is on f5 and does not have the tempi to threaten the knight. The white king must move to e4, the black king can then move to e6 blocking the white king's advance. |
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| Jul-14-10 | | tacticalmonster: 1)The b7 pawn restrict the movement of the knight to only Nc6-Nb8-Na6 2)The removal of isolated h6 pawn is diastrous to Black game bec it would give White two outside passed pawns. Unfortunately, white king cannot find inroad to this weak pawn at the moment. 3)White wants to remove the c5 pawn to create connected queenside passers Candidate: Bxf5
a) 1 exf5 2 Kxf5 Nb8 ( black king can`t move without allowing white king to either penetrate to the kingside or queenside) (Black also cannot leave the Nc6-Nb8-Na6 triangle; 2 Nd4+ 3 Ke4 Nc6 4 Kd5 Nb8 5 Kxc5 ) Now the moment of truth: whelther to play 3 f3 or f4. ( if 3 f3 Na6 4 f4 Nb8 5 g4 Na6 6 g5 fxg5 7 fxg5 hxg5 8 Kxg5 Kg7 9 Kf5 Kh6 10 Ke6 Kxh5 11 Kd6 Kg6 12 Kc6 Kf6 13 Kb6 Nb8 14 Kxc5 Ke7 15 Kb6 Kd7 16 c5 Nc6=) so: 3 f4 Na6 4 g4 Nb8 5 g5 fxg5 6 fxg5 hxg5 7 Kxg5 Kg7 ( 7 Na6 tranposes) 8 Kf5 Kh6 9 Ke5 Kxh5 10 Kd5 Na6 (if 10 Kg6 11 Kxc5 Kf7 12 Kd6! Ke8 13 c5 Kd8 14 c6 ) 11 Kc6 Kg6 12 Kb6 Nb8 13 Kxc5 Kf7 14 Kd6! tranpose to the above. b) 1 Nb8 2 Be4 Ke7 3 g4 Kf7 4 Ke3 - Black has absolutely no counterplay in a dead lost ending: White king will move to the b5 square to attack and capture the weak c5 pawn to create a crushing connected b and c passers. If Black stops this plan by moving the king to b6 or defend the c pawn with Kd6, then White will initates a kingside breakthrought with f4-g5 creating a passed h pawn. Black has no defence. |
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| Jul-14-10 | | tacticalmonster: Opps! I got the solution but I thought black king is on f7 than e7 in the starting position of the puzzle. |
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| Jul-14-10 | | tacticalmonster: looking through previous posts posted by our dear kibitzers, I just realize the key difference bet Gm and us mortal. There is two type of common kibitzers: a) the calculating machine and b) the long term strategist. 1) Type A will just look for any excuse to calculate. When by chance they stumble on the right move to calculate, they will usually solve the position after carefully looking at the consequence. However, the weakness of this style is very often with just blind calculation they won`t find the right move. Suggestion: Try to understand the position and figure out some sort of plan before you calculate. Playing this way you will save lots of valuable time from thinking too much on the wrong move.
Like a doctor, first you diagnose a patient and then you prescribe the right treatment. Reverse the order and it will be like calculation without a plan. 2) Type B is the exact opposite of type A and they will look for any excuse not to calculate. They tend to look at the big picture and ignore the minor details. Time and time again you will hear them moaning about " found the best plan but overlook a cheapo that ruined everything" or lame excuses like " the plan work but I screwed up the move order ". These excuses are like the clinche: " The operation is a success but the patient did not make it ". Suggestion: Conceving a great plan completes only 20% of the equation and the other 80% is execution! Type B player should spend lots of time doing visualiztion training and tactical puzzles. Only through concrete analysis can your great plan come into fruition. Gm have just the right mixture of both elements. They can look at the position concretely and at the same time conceptually. They know when to calculate and when not to calculate. They know most of the time how many moves they should look ahead in each particular position. Their great plans are often backed up by concrete analysis. I believe learning how to use both skills intellectually can make a formidable opponent. |
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| Jul-17-10 | | Utopian2020: 55. Bxf5 exf5, 56. Kxf5 Kf7 eventually leads to this postion with white to move. 
click for larger viewYes white has taken the c5 pawn but cannot connect the two passers. Neither can the white king eliminate the black knight. c6 Nxc6, b8=Q Nxb8 draws.
Ka7 Nc6+, Ka8 Kxc5, b8=Q Nxb8 draws.
Kc7 Na6+, Kc8 Kxc5, b8=Q Nxb8 draws.
Kc7 Nc6, b8=Q Nxb8, Kxb8 Kxc5 draws.
There are more variations, but they are end in a draw. Karpov blundered, this position is a draw folks. |
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| Jul-17-10 | | Utopian2020: Black to move. Another look a few moves earlier. Again it is clearly a draw.
click for larger view...Nb8, Kxc5 has been examined above.
...Nb8, Kc7 Na6+, Kb6 Nb8, there is nothing the white king can do get elimnate the black knight. |
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| Jul-17-10 | | Utopian2020: Still don't believe me. Let's go back a few more moves. Here the White king has finally abandoned the h5 file pawn. Black to move.
click for larger view...Kxh5, kd6 kg4, kc6 kf5, kb6 Nb8 and we are back at the two position analyzed above as draws. Conclusion: Karpov blundered, this game could have ended in a draw. |
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| Jul-24-10 | | tacticalmonster: <Utopian2020> You are right. This position is a draw: Black to play
click for larger viewHowever, this position is a win: Black to play
click for larger viewThat is why move 58 is the key to this puzzle. Should White play f4 or f3? I am the only kibitzer who realize the difference bet the two key pawn moves without looking at the solution or consulting the computer. <Utopian2020> If you have bothered to look at what the other kibitzers said, you would not have thought the position is drawn after Bxf5! |
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| Dec-25-17 | | birthtimes: Why not 42...cxb?! By not doing so, Karpov allows an outside protected passed pawn to be created... |
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| Nov-18-24 | | FM David H. Levin: <<birthtimes>: Why not 42...cxb?!> After 42...cxb4 43.c5, Black's king can't catch the c-pawn: 43...Kf8 44.c6 Ke7 45.c7, and the king is cut off from the c8-square. Black's knight is also too far away to blockade the c-pawn. That leaves 43...b3 44.c6 b2 45.Bc2 Nb3 46.c7 Nd2+ 47.Ke2 b1=Q 48.Bxb1 Nxb1 49.c1=Q+, and Black's knight will soon be lost. So, it seems that 42...cxb4 would lose by force. |
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| Nov-18-24 | | FM David H. Levin: When Ed Allen and I went over this game, he thought of 31...Nc6,
intending 32.Bxc6 Qd1+ 33.Kh2 Qxh5+ 34.Kg3 Be7 35.Bb8 (so that the bishop wouldn't be lost due a discovered check). 
click for larger viewThen we continued 35...Bh4+ 36.Kh2 Bxf2+ 37.Qh3 Qd1 38.Qf3 Qg1+ 39.Kh3 Qh1+ 40.Bh2 Bg1 41.Qg3 
click for larger viewand wondered whether White could win from here.
Later, the silicon analyst showed me that from the first diagram, 35...f5 seems to give Black perpetual check at least. Conclusion: after 31...Nc6, White might have to be content with a draw. |
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| Nov-18-24 | | Olavi: 40...Bf6 was a simple blunder on the last move before the time control. Black had no worries, so the analysis of 31..Nc6 is a bit redundant - unless it's a move with which Black fancies his winning chances. |
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